Why the polar contour plot are reversly showed?

Hi,

I'm wondering why the ploar contour plot are reversly showed.

According to the data, Carbon.mat

The values are monotonically decreased, but contour figure showes reversely.

It seems quite strange, I have no idea about it.. I flipped the matrix but it doesn't work.

The graph is the result of running below codes, as you see in the figure value between core and surface are flipped..!

      x             = linspace( 0, 49 , 50 ) ;
     theta         = ( 0 : 0.5 : 90 ) * (pi/180) ;
     [ th, r ]      = meshgrid (theta, Carbon) ;
     surf ( r.*cos(th), r.*sin(th), repmat(Carbon(:), 1, size(th,2)), 'linestyle', 'none' ) ;
     view(2) ; grid off ; colorbar ;

Anyone could help me?

Thanks you in advances :D

Answer 1

[Walter Roberson]

     [ th, r ]      = meshgrid (theta, Carbon) ;

Should be meshing theta and x.

Consider using pol2cart()